CN114038644B - General transmitting end PCB coil mechanism - Google Patents

General transmitting end PCB coil mechanism Download PDF

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CN114038644B
CN114038644B CN202111502485.0A CN202111502485A CN114038644B CN 114038644 B CN114038644 B CN 114038644B CN 202111502485 A CN202111502485 A CN 202111502485A CN 114038644 B CN114038644 B CN 114038644B
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coil
gating connection
gating
end point
pcb
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CN114038644A (en
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张华�
张蔚方
魏丽丽
杨郑龙
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Shanghai University of Engineering Science
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/003—Printed circuit coils
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
    • H01F5/00—Coils
    • H01F5/04—Arrangements of electric connections to coils, e.g. leads
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05K—PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS
    • H05K1/00—Printed circuits
    • H05K1/16—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor
    • H05K1/165—Printed circuits incorporating printed electric components, e.g. printed resistor, capacitor, inductor incorporating printed inductors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Microelectronics & Electronic Packaging (AREA)
  • Magnetic Resonance Imaging Apparatus (AREA)

Abstract

The invention relates to a universal transmitting end PCB coil mechanism, which comprises a PCB coil, a coil contact gating connection module and a gating connection control module, wherein the coil contact gating connection module comprises two end gating connection units, a first end gating connection unit and a second end gating connection unit; the PCB coil comprises a plurality of strands of coils, each strand of coils is provided with an opening end, namely a first end point and a second end point, and the connecting points of the connecting coils are connected with the gating connection module; the gating connection control module is connected with the connecting point gating connection module and controls the on-off of a circuit in the coil connecting point gating connection module, so that the first end point and the second end point of each strand of coil are connected with other first end points and second end points. Compared with the prior art, the invention ensures that the PCB coil mechanism always meets the uniform magnetic field distribution when the power and the position change, ensures the high efficiency and stability of the transmission efficiency and the transmission power, and improves the capacity of the opposite side movement between the coils; can be adapted to any receiving end, and has good universality.

Description

General transmitting end PCB coil mechanism
Technical Field
The invention relates to the field of design of a transmitting end PCB coil, in particular to a universal transmitting end PCB coil mechanism with uniform magnetic field distribution.
Background
With the advent of the internet age, small portable terminals typified by wearable devices, smart home wireless sensor networks, implantable biomedical devices, and the like are becoming popular. But is limited by the energy density of the battery, so that the endurance capacity of the intelligent terminal is limited, and frequent charging is needed. The wireless power transmission technology effectively solves the problems of non-uniform power supply interfaces of electric equipment, poor dustproof and waterproof capability, easiness in ignition due to live plug and the like, so that the attention of the technology is rapidly increased, and the technology gradually goes into the life of people, and becomes one of research hotspots of multiple intersecting subjects. However, in the existing wireless energy transmission device, the PCB coil of the transmitting end and the PCB coil of the receiving end are both of fixed structures, and the parameters of the two coils are matched to optimize the power and the efficiency, so that the applicability and the universality of a single transmitting end are poor. Meanwhile, the uneven distribution of the magnetic field in the existing transmitting end coil can cause serious reduction of power and efficiency when the receiving coil generates lateral movement.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a universal transmitting end PCB coil mechanism with uniform magnetic field distribution.
The aim of the invention can be achieved by the following technical scheme:
the utility model provides a general transmitting end PCB coil mechanism, includes PCB coil, coil contact gate connection module and gate connection control module, wherein:
the coil contact gating connection module comprises two end gating connection units, a first end gating connection unit and a second end gating connection unit;
the PCB coil comprises a plurality of strands of coils, an opening end is arranged on each strand of coil, two end points of the opening end are respectively a first end point and a second end point, the first end point is connected with a first end point gating connection unit and two end gating connection units, and the second end point is connected with a second end point gating connection unit and two end gating connection units;
the gating connection control module is connected with the first endpoint gating connection unit and used for controlling the on-off of a circuit in the first endpoint gating connection unit so that any one first endpoint is connected with one or more other first endpoints;
the gating connection control module is connected with the second endpoint gating connection unit and is used for controlling the on-off of a circuit in the second endpoint gating connection unit so that any second endpoint is connected with one or more other second endpoints;
the gating connection control module is connected with the two-end gating connection units and used for controlling the on-off of a circuit in the two-end gating connection units so that any one first endpoint is connected with one or more second endpoints; or any second endpoint connects to one or more first endpoints.
Further, the multi-strand coil in the PCB coil forms a coil, the multi-strand coil forms a coil, the gating connection control module executes a magnetic field uniform distribution optimization algorithm to obtain the number of sections, the number of turns and the number of strands required by the mechanism, so that a circuit of the coil joint gating connection module is controlled to enable a first end point and a second end point in the PCB coil to be connected, and a complete coil meeting the requirements of the number of sections, the number of turns and the number of strands is formed.
Further, the number of the coil strands of the PCB coil is an integer multiple of 10.
Further, the magnetic field uniform distribution optimization algorithm adopts a traversal algorithm.
Further, the magnetic field uniform distribution optimization algorithm comprises the following steps:
s1, performing simulation of a sending coil and a receiving coil according to given parameter settings, wherein the parameters comprise the number of segments, the number of turns and the number of strands of a PCB coil;
s2, obtaining a mutual inductance value of the coil according to the simulation condition;
s3, judging whether the mutual inductance standard deviation coefficient is smaller than a set target threshold value, and if so, outputting current parameters; if not, the next set of given parameters is selected to re-execute step S1.
Further, the calculation formula of the mutual inductance value of the coil is as follows:
Figure BDA0003402853300000021
wherein M is ij Representing the mutual inductance value between the ith turn and the jth turn of the coil; r is (r) i And r j Representing the radius of the ith and jth turns of the coil; d, d i,j Representing the inter-turn distance between the ith turn and the jth turn of the coil; θ represents the surrounding angle of the coil; mu (mu) 0 Indicating vacuum permeability.
Further, the calculation expression of the mutual inductance standard deviation coefficient is:
Figure BDA0003402853300000022
Figure BDA0003402853300000031
wherein M is P Mean value of mutual inductance M i The mutual inductance value is represented, m represents the number of sampling points, S represents the standard deviation, and Fs represents the standard deviation coefficient.
Compared with the prior art, the invention has the following beneficial effects:
the invention designs the PCB coil, the coil contact gating connection module and the gating connection control module, under the control of the gating connection control module, the coil contact gating connection module can enable the first end point and the second end point in the PCB coil to form a connection combination, so that when the lateral movement position changes, the PCB coil mechanism always meets the uniform magnetic field distribution, the transmission efficiency and the high efficiency and the stability of the transmission power are improved, and the opposite lateral movement capacity between the coils is improved; meanwhile, the structure can be also adapted to any receiving end, and has good universality.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic structural view of a PCB coil.
Fig. 3 is a schematic diagram of the PCB coil after the first and second terminals are turned on.
Fig. 4 is a schematic flow chart of a magnetic field uniform distribution optimization algorithm.
Reference numerals: 1. the PCB coil, 11, the first end point, 12, the second end point, 2, the coil joint gating connection module, 21, the first end point gating connection unit, 22, the second end point gating connection unit, 23, the two end gating connection unit, 3, the gating connection control module.
Detailed Description
The invention will now be described in detail with reference to the drawings and specific examples. The present embodiment is implemented on the premise of the technical scheme of the present invention, and a detailed implementation manner and a specific operation process are given, but the protection scope of the present invention is not limited to the following examples.
As shown in fig. 1, the present embodiment provides a general transmitting-end PCB coil mechanism, which includes a PCB coil 1, a coil contact gating connection module 2, and a gating connection control module 3.
The coil contact gate connection module 2 includes a two-terminal gate connection unit 23, a first terminal gate connection unit 21, and a second terminal gate connection unit 22. The PCB coil 1 comprises a plurality of strands of coils, each strand of coils is provided with an opening end, two end points of the opening end are respectively a first end point 11 and a second end point 12, and the first end point 11 on each strand of coils is connected with a two-end gating connection unit 23 and a first end point gating connection unit 21; the second endpoint 12 connects the two-terminal gating connection unit 23 and the second endpoint gating connection unit 22. The control information output end of the gating connection control module 3 is connected with the control information input end of the coil joint gating connection module 2 and is used for controlling the on-off of a circuit in the coil joint gating connection module 2, so that the first end point 11 and the second end point 12 of each strand of coil are connected with other first end points 11 or second end points 12 through the two-end gating connection unit 23, the first end point gating connection unit 21 and the second end point gating connection unit 22.
As shown in fig. 2, the width of each strand of the PCB coil 1 is the same in this embodiment, for example, 1mm; the spacing between adjacent coils is the same, e.g. 2mm. On the PCB coil 1, the first end 11 of each strand of coil is thus set from inside to outside as JA1, JA2, … …, JAi; the second end point 12 of each strand of coil is thus set as JB1, JB2, … …, JBi from inside to outside. Definition the multi-strand coil in the PCB coil 1 constitutes a coil, the multi-turn coil constitutes a coil, and the number of coil strands is preferably an integer multiple of 10, such as 10, 20, 30, etc.
The gating connection control module 3 executes a magnetic field uniform distribution optimization algorithm to obtain the number of segments, turns and strands required by the mechanism, so that circuits of the two-end gating connection unit 23, the first end gating connection unit 21 and the second end gating connection unit 22 are controlled to enable the first end 11 and the second end 12 in the PCB coil 1 to be connected, and a complete coil meeting the requirements of the number of segments, the number of turns and the strands is formed.
The connection command sent by the gate connection control module 3 to the coil contact gate connection module 2 includes, but is not limited to:
I. any two adjacent joints JA1, JA2, … … and JAi in the first coil end point 11 are connected together according to requirements;
II. Any two adjacent joints JB1, JB2, … … and JBi in the second end 12 of the coil are connected together as required;
III, one or more joints JA1, JA2, … …, JAi in the first end 11 of the coil are connected with one or more joints JB1, JB2, … …, JBi corresponding to the same-strand coil in the joints of the second end 12 according to requirements.
As shown in fig. 3, a 12-strand PCB coil is schematically shown for a uniform magnetic field distribution that meets a specific load parameter.
As shown in fig. 4, the magnetic field uniform distribution optimization algorithm in this embodiment adopts a traversal algorithm, and specifically includes the following steps:
step S1, simulation of a transmitting coil and a receiving coil is carried out according to given parameter settings, wherein the parameters comprise the number of segments, the number of turns and the number of strands of the PCB coil 1.
And S2, obtaining the mutual inductance value of the coil according to the simulation condition.
S3, judging whether the mutual inductance standard deviation coefficient is smaller than a set target threshold, wherein the general target threshold is 0.1, and if yes, outputting the current parameter; if not, the next set of given parameters is selected to re-execute step S1.
The following principles are included for the traversal order, but are not limited to:
I. the number of strands of the coil from the center to the outer ring, adjacent to the corresponding section near the outer ring, is equal to or less than the number of strands corresponding to the adjacent inner ring, for example: three for loops are designed, namely, the loops of sections, turns and strands are sequentially designed, and if the strand number of a first section close to the inner ring is 3, the strand number of a second section adjacent to the inner ring and further away from the inner ring can only be less than or equal to 3.
II. The upper limit value of the number of segments, turns and strands in each traversal process is limited by the total strands. If the total number of strands is 12 strands and the total number of segments is 2, the number of strands in the first segment and the first turn can only be cycled from 1 to 11, because the second segment has at least 1 strand.
The simulation adopts Maxwell software simulation, and the process comprises the following steps: 1. drawing a transmitting coil and a receiving coil in a Maxwell according to parameters such as given turns, turn intervals, line widths and the like; 2. given transmit coil current (e.g., 1A), frequency (e.g., 6.78M); 3. setting the receiving coil along the y-axis, gradually approaching the central point of the transmitting coil from a far distance, and equally dividing the values as scanning parameters, and calculating mutual inductance values at different positions by simulation software.
In the above steps, the calculation formula of the mutual inductance value of the coil is:
Figure BDA0003402853300000051
wherein M is ij Representing the mutual inductance value between the ith turn and the jth turn of the coil; r is (r) i And r j Representing the radius of the ith and jth turns of the coil; d, d i,j Representing the inter-turn distance between the ith turn and the jth turn of the coil; θ represents the surrounding angle of the coil; mu (mu) 0 Indicating vacuum permeability.
In the above steps, the steps of calculating the mutual inductance standard deviation coefficient are as follows:
the length, width and total number of turns of the PCB coil 1 connected with the rear transmitting end are known as d out_L 、d out_W 、N t . The coil is divided into N sections with the number of N being more than or equal to 2 according to the number of turns and the size of the coil, each section is provided with the serial number of i, and each section comprises the number of turns of the coil of N i The coil of each turn is formed by T i The strand wires are wound in parallel. Thus, the total number of strands of the coil is
Figure BDA0003402853300000052
The receiving coil is arranged along the y axis in y min <y<y max E.g., -70mm to 70mm, and uniformly selecting m sampling points.
The calculation expression of the mutual inductance standard deviation coefficient is as follows:
Figure BDA0003402853300000053
wherein M is P Mean value of mutual inductance M i The mutual inductance value is represented, m represents the number of sampling points, S represents the standard deviation, and Fs represents the standard deviation coefficient.
The foregoing describes in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be made in accordance with the concepts of the invention by one of ordinary skill in the art without undue burden. Therefore, all technical solutions which can be obtained by logic analysis, reasoning or limited experiments based on the prior art by the person skilled in the art according to the inventive concept shall be within the scope of protection defined by the claims.

Claims (4)

1. The utility model provides a general sender PCB coil mechanism which characterized in that includes PCB coil (1), coil contact gating connection module (2) and gating connection control module (3), wherein:
the coil contact gating connection module (2) comprises a two-end gating connection unit (23), a first end gating connection unit (21) and a second end gating connection unit (22);
the PCB coil (1) comprises a plurality of strands of coils, an opening end is arranged on each strand of coils, two end points of each opening end are a first end point (11) and a second end point (12), the first end point (11) is connected with a first end point gating connection unit (21) and two end point gating connection units (23), and the second end point (12) is connected with a second end point gating connection unit (22) and two end point gating connection units (23);
the gating connection control module (3) is connected with the first endpoint gating connection unit (21) and is used for controlling the on-off of a circuit in the first endpoint gating connection unit (21) so that any one first endpoint (11) is connected with one or more other first endpoints (11);
the gating connection control module (3) is connected with the second endpoint gating connection unit (22) and is used for controlling the on-off of a circuit in the second endpoint gating connection unit (22) so that any second endpoint (12) is connected with one or more other second endpoints (12);
the gating connection control module (3) is connected with the two-end gating connection units (23) and is used for controlling the on-off of a circuit in the two-end gating connection units (23) so that any first endpoint (11) is connected with one or more second endpoints (12); or any second endpoint (12) connected to one or more first endpoints (11);
the multi-strand coil in the PCB coil (1) forms a coil with one turn, the multi-turn coil forms a coil with one section, the gating connection control module (3) executes a magnetic field uniform distribution optimization algorithm to obtain the number of sections, turns and strands required by a mechanism, so that a circuit in the coil joint gating connection module (2) is controlled to enable a first end point (11) and a second end point (12) in the PCB coil (1) to be connected, and a complete coil meeting the requirements of the number of sections, the number of turns and the strands is formed;
the magnetic field uniform distribution optimization algorithm comprises the following steps:
s1, performing simulation of a transmitting coil and a receiving coil according to given parameter settings, wherein the parameters comprise the number of segments, the number of turns and the number of strands of a PCB coil (1);
s2, obtaining a mutual inductance value of the coil according to the simulation condition;
s3, judging whether the mutual inductance standard deviation coefficient is smaller than a set target threshold value, and if so, outputting current parameters; if not, selecting the next set of given parameters to re-execute the step S1;
the calculation expression of the mutual inductance standard deviation coefficient is as follows:
Figure FDA0004238131230000021
Figure FDA0004238131230000022
Figure FDA0004238131230000023
wherein M is P Mean value of mutual inductance M i The mutual inductance value is represented, m represents the number of sampling points, S represents the standard deviation, and Fs represents the standard deviation coefficient.
2. A universal transmitting-end PCB coil arrangement according to claim 1, characterized in that the number of coil strands of the PCB coil (1) is an integer multiple of 10.
3. The universal transmitting-end PCB coil mechanism of claim 1, wherein the magnetic field uniform distribution optimization algorithm employs a traversal algorithm.
4. The universal transmitting-end PCB coil mechanism of claim 1, wherein the mutual inductance value of the coil is calculated as:
Figure FDA0004238131230000024
wherein M is ij Representing the mutual inductance value between the ith turn and the jth turn of the coil; r is (r) i And r j Representing the radius of the ith and jth turns of the coil; d, d i,j Representing the inter-turn distance between the ith turn and the jth turn of the coil; θ represents the surrounding angle of the coil; mu (mu) 0 Indicating vacuum permeability.
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WO2017027326A1 (en) * 2015-08-07 2017-02-16 Nucurrent, Inc. Single layer multi mode antenna for wireless power transmission using magnetic field coupling
CN205193133U (en) * 2015-09-15 2016-04-27 深圳市信瑞达电力设备有限公司 Current measurement device
CN112752401A (en) * 2019-10-29 2021-05-04 汕头凯星印制板有限公司 Printed circuit board type multipoint variable inductance coil and manufacturing method thereof
JP2021150442A (en) * 2020-03-18 2021-09-27 島田理化工業株式会社 Coil unit, non-contact power feeding device, non-contact power receiving and feeding system, induction heating device, and electromagnetic cooker

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